Page 1 – Dynamic Motion

IEM companies are plenty to the dozen but sometimes I just find myself taking an interest to a brand. In this particular case it was off the recommendation of one of my Korean friends John Lee (whose portable amps we will soon be reviewing) after he come across a native brand at an audio show and liked their new release, the DM200H. Consequently I got in touch with the Korean Dynamic Motion to see if something could be arranged in terms of product reviews and they were more than giving, supplying me 5 different models. So today we are getting to know Dynamic Motion and having a look right through their portfolio.

Before we get right into it lets look at Dynamic Motion as a brand. Having been around since 1982 they have always maintained a focus on high quality dynamic speakers and also putting their customers first. Looking through their different models they certainly seem to be an innovator, using a range of different driver technologies for specific goals and models, going as far as gaining patents on their unique dynamic drivers. While they do also produce headphones, I have looked solely at earphones from the brand all the way from their £10 (16,800SKW) DM010 up to their £170 ($249) DM200H. They also have a $349 DM300H coming later.


DM’s Own

Of the models I have we have 4 core technologies in play. First of all we have the General Dynamic driver as seen in the cheapie DM010 which to me seems to be nothing out of the ordinary, just a dynamic driver as you know and they don’t seem to put a focus on why it may be better than any other variation of it. It is only when we get up into the rest of the line we start to get into these more advanced techniques, starting with the Balanced Dynamic Driver (BDD) that is used in both the DM100E and DM100 that I have.

16DM-9 16DM-8

BDD is completely designed to reduce the THD of a conventional dynamic driver, such as what you get with the DM010’s general dynamic.

“Old dynamic driver’s diaphragm has inherent disadvantages such as a side vibration and long under damping time. Those disadvantages make the THD worse. So we designed a unique structure that functions as a suspension. This suspension helps the diaphragm to prevent the side vibration and to minimize the under-damping time.”

In the end we have under 1% THD for the entire frequency range and a sound that claims to be more akin to a balanced armature. We will see how that goes….

The next is Power Dynamic Driver or PDD that is used in the DM008. The idea is that it enables the use of a smaller diaphragm but still allow a deep bass response. The downside is that they cost more and are difficult to optimise. To me that may seem like extra work and cost to do something that would be achievable with bigger drivers, with the main benefit in size and potential ergonomics. The main cause of the advanced ability is the use of a thin film over the diaphragm, causing a large amplitude. At further inspection this is not a brand new method, its just a small modification of other small drivers, using a much more expensive PEI film than the more common PET film.


Lastly we have their flagship technology that is in their just released DM200H and upcoming DM300H. It is the Bulls Eye Driver (BED). To simplify this is Dynamic Motion’s take on the currently over abused hybrid arrangement. By hybrid I mean using both a dynamic and balanced armature driver with a crossover between them. Dynamic Motion have laid it out almost like a dual concentric speaker design. Once again it is actually quite the departure to the norm when placing the two variations of driver together with DM concentrating mostly towards phase alignment. They have found any distance between the drivers puts them slightly out of phase and therefore their methods helps align that issue. This did take them having to specifically design a dynamic driver with a hole in the middle, like a bulls eye, that could hold a BA driver and do so without any sacrifice in sound or acoustic performance. It also helps them use less space! Certainly seems like a fresh take.

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Now we have the technology down, lets get right into the packaging on the next page.

Sonny Trigg
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